You are quite correct: 17.45 mrad = 1 deg, not 1 arc minute. However 4.848 microrad = 1 arc second, or approximately 5 microrad. You may be thinking of 1 arc mjnute = 0.2909 mrad Gordon At 02:13 PM 2/15/00 -0800, Dave Bell wrote:
Whups! You meant a *degree* is ~17 mRadian, didn't you? An arcsec is very close to 0.3 mR or 300 uR... Still, 0.3 mR for a fine feature, or 1.5 mR for a character are still pretty convenient units for visual acuity. And the Tan function becomes trivial in that regime... Dave
Gordon Uber [EMAIL PROTECTED] San Diego, California USA Webmaster: Clocks and Time: http://www.ubr.com/clocks
